Multiple parallel encoders and statistical analysis thereof for encoding a video sequence
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a video sequence and encoder technology, applied in the field of multi-stage techniques for encoded video sequences, can solve the problems of mpeg standard limiting the size of the bitstream, requiring an enormous amount of network bandwidth, and reducing the efficiency of such systems, so as to improve the picture quality of the encoded video sequence and achieve high compression rate
Inactive Publication Date: 2006-07-04
IBM CORP
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[0013]This invention seeks in part to enhance picture quality of an encoded video sequence while still obtaining a high compression rate by providing multiple encoders and statistical analysis
Problems solved by technology
In order to provide services such as video-on-demand and video conferencing to subscribers, an enormous amount of network bandwidth is required.
In fact, network bandwidth is often the main inhibitor in the effectiveness of such systems.
T
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[0027]The invention relates, for example, to MPEG compliant encoders and encoding processes such as described in “Information Technology-Generic coding of moving pictures and associated audio information: Video,” Recommendation ITU-T H.262, ISO / IEC 13818-2, Draft International Standard, 1994. The encoding functions performed by the encoder include data input, spatial compression, motion estimation, macroblock type generation, data reconstruction, entropy coding, and data output. Spatial compression includes discrete cosine transformation (DCT), quantization, and entropy encoding. Temporal compression includes intensive reconstructive processing, such as inverse discrete cosine transformation, inverse quantization, and motion compensation. Motion estimation and compensation are used for temporal compression functions. Spatial and temporal compression are repetitive functions with high computational requirements.
[0028]More particularly the invention relates, for example, to a process ...
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Abstract
System and method are provided for optimally encoding a sequence of video frames using image statistics collected from multiple encoders connected in parallel, each encoder employing a different set of encode parameters. The image statistics are used to select an optimum set of encode parameters for use in encoding the sequence of video frames in a subsequent encode subsystem stage. As an alternative, multiple buffers are connected to the outputs of the multiple, parallel connected encoders, with the encoded stream from the encoder employing the optimum set of encode parameters selected for output as the bitstream of encoded video data.
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CROSS-REFERENCE TO RELATED PATENTS / APPLICATIONS[0001]This application contains subject matter which relates to the subject matter of the following commonly-owned patents, each of which is hereby incorporated herein by reference in its entirety:[0002]“Adaptive Real-Time Encoding of Video Sequence Employing Image Statistics”, U.S. Pat. No. 6,040,861, issued Mar. 21, 2000;[0003]“Real-Time Variable Bit Rate Encoding of Video Sequence Employing Image Statistics”, U.S. Pat. No. 6,097,757, issued Aug. 1, 2000;[0004]“Real-Time Encoding of Video Sequence Employing Two Encoders and Statistical Analysis”, U.S. Pat. No. 5,978,029, issued Nov. 2, 1999;[0005]“Control Scheme For Shared-Use Dual-Port Predicted Error Rate”, U.S. Pat. No. 6,118,823, issued Sep. 12, 2000; and[0006]“Optimized Field-Frame Prediction Error Calculation Method and Apparatus In A Scalable MPEG-2 Compliant Video Encoder”, U.S. Pat. No. 6,081,622, issued Jun. 27, 2000.TECHNICAL FIELD[0007]This invention relates, in general, t...
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